Preheat broiler; spray a baking sheet with cooking spray.,Place the bread in a food processor and process until fine crumbs form.,Transfer the crumbs to a bowl and sprinkle evenly with the milk.,Heat 1 tablespoon oil in a nonstick skillet over medium heat.,Add in the onion and cook, stirring, until softened, about 5 minutes.,In a big bowl, mix together the moistened bread crumbs, onion, beef, egg, nutmeg, 1/2 teaspoon salt, allspice, and black pepper to incorporate.,Form mixture into 1/2-inch balls and place them on the prepared baking sheet.,Broil about 5 inches from the flame, until browned and cooked through, 6-7 minutes.,Heat the remaining 2 tablespoons oil in a medium saucepan over med-high heat.,Sprinkle in the flour and whisk until the mixture is light brown and thickened, 2-3 minutes.,Add in the beef broth and stir to incorporate.,Bring to a boil; decrease heat to med-low, and simmer until thickened, about 5 minutes.,______,Add the meatballs and cook over med-low heat until heated through, about 5 minutes; taste and adjust seasoning if needed.,Serve garnished with parsley.,Serving: 5 meatballs and 3 T sauce; per serving-220 calories, 14 g total fat, 6 g carb, 1 g fiber.